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what is unipolar pam


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  • 3 weeks later...

I worked with a huge intercom system that multiplexed many conversations and background music internally along a single wire using PAM. The instantaneous amplitude of each conversation was sampled in its time-slot then a sample-and-hold stage held it until the multiplexer came around again to its time slot for the next sample. Of course, the multiplexer operated at a very high frequency. After being decoded in its time slot and filtering, it sounded nearly perfect.
I had to soup-it-up so it met the strict "broadcast quality" spec's for the PA at international airports. Nearly CD quality sound. ;D

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